The late Svecofennian granite-migmatite zone of southern Finland—a belt of transpressive deformation and granite emplacement

Ehlers, Carl; Lindroos, Alf; Selonen, Olavi

doi:10.1016/0301-9268(93)90083-e

Cited by 150 publications

(152 citation statements)

References 21 publications

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“…The granites within the the LSGM zone occur as sheets in generally gently dipping planar structures (Ehlers et al 1993, Selonen et al 1996. Ehlers et al (1993) presented a model for the granites of the LSGM zone including emplacement 1840-1830 Ma ago along pre-existing subhorizontal structures and simultaneous westward translation; i.e.…”

Section: Discussionmentioning

confidence: 99%

Structural and magmatic evolution in the Loimaa area, southwestern Finland

Nironen¹

1999

Bull Geol Soc Finland

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Section: Discussionmentioning

confidence: 99%

Structural and magmatic evolution in the Loimaa area, southwestern Finland

Nironen¹

1999

Bull Geol Soc Finland

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“…1; e.g. Ehlers et al, 1993;Lahtinen et al, 2005, and references therein; Levin et al, 2005). The last Palaeoproterozoic compressive event that significantly affected the Fennoscandian Shield was the continent-continent collision -type Nordic orogeny at 1.82-1.79 Ga with subduction from the NW-WNW (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…To the NE, a c. 200 km wide belt (the Late-Svecofennian GraniteMigmatite belt, LSGM in Fig. 1; Ehlers et al, 1993) extends across southern Finland. The LSGM rocks consist of structurally overturned and tectonically stacked supracrustal rocks, metamorphosed in up to granulite facies conditions (e.g.…”

Section: Geological Settingmentioning

confidence: 99%

“…The LSGM rocks consist of structurally overturned and tectonically stacked supracrustal rocks, metamorphosed in up to granulite facies conditions (e.g. Ehlers et al, 1993;Väisänen & Hölttä, 1999). The LSGM rocks are extensively migmatised and intruded by subhorizontal sheets of anatectic granites and tonalites at 1.85-1.82 Ga (e.g.…”

Section: Geological Settingmentioning

confidence: 99%

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Microstructures associated with the Sottunga-Jurmo shear zone and their implications for the 1.83-1.79 Ga tectonic development of SW Finland

Torvela¹,

Ehlers²

2010

Bull Geol Soc Finland

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This petrographic study of rock samples from the area of a large-scale shear zone, the Sottung-Jurmo shear zone, in SW Finland, illuminates the thermal development of and strain distribution within the rocks during the last development stages of the shear zone. The results indicate relatively high temperatures during the deformation phases that created the gneisses and the mylonites, strain partitioning through time and continued transpression from S-SW until at least c. 1.79 Ga. This has implications to the latest tectonic models since the results together with previous studies suggest a compartmentalisation of regional stresses between the area SW of the shear zone and central Fennoscandia. The results also suggest that the uplift rate increased during the late stage of the transpression.

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“…The original volcanic and volcano-sedimentary formations were subject to multistage deformation and metamorphism, resulting in a complex mosaic of the Svecofennian Orogen (e.g. Ehlers et al, 1993;Nironen, 1997;Korsman et al, 1999;Korja & Heikkinen, 2005;Lahtinen et al, 2005). Because of deformation partitioning, part of the Orijärvi area escaped the most severe overprinting tectonometamorphism and, therefore, makes an excellent locality to study the early Svecofennian crustal growth in southern Finland (Ploegsma & Westra, 1990;Skyttä et al, 2006).…”

Section: Geological Settingmentioning

confidence: 99%

U-Th-Pb zircon geochronology on igneous rocks in the Toija and Salittu Formations, Orijärvi area, southwestern Finland: Constraints on the age of volcanism and metamorphism

Väisänen¹,

Kirkland²

2008

Bull Geol Soc Finland

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Zircons from a felsic volcanic rock in the Toija Formation and a synvolcanic gabbro intrusion in the Salittu Formation within the Orijärvi area were dated by U-Th-Pb SIMS in order to provide depositional constraints on these formations. Zircon crystals from the felsic rock preserve a two-stage crystallisation history with zoned core domains and homogeneous rim domains. Inner domains yield a 1878 ± 4 Ma concordia age, interpreted to determine the crystallisation of this rock. Rims yield a 1815 ± 3 Ma concordia age interpreted to determine the regional metamorphism. Small rounded zircon grains from the Salittu gabbro, located within the Jyly shear zone, yield a concordia age of 1792 ± 5 Ma. We interpret the grain textures to suggest that they recrystallised from inherited zircon seeds during the heat and fluid flow into the shear zone. Although no direct ages for the Salittu Formation have been recovered, field relationships imply that it was deposited between 1878 − 1875 Ma.

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The late Svecofennian granite-migmatite zone of southern Finland—a belt of transpressive deformation and granite emplacement

Cited by 150 publications

References 21 publications

Structural and magmatic evolution in the Loimaa area, southwestern Finland

Structural and magmatic evolution in the Loimaa area, southwestern Finland

Microstructures associated with the Sottunga-Jurmo shear zone and their implications for the 1.83-1.79 Ga tectonic development of SW Finland

U-Th-Pb zircon geochronology on igneous rocks in the Toija and Salittu Formations, Orijärvi area, southwestern Finland: Constraints on the age of volcanism and metamorphism

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